G.S. Helfman

The contribution of headwater streams to biodiversity in river networks
Meyer, J.L., David L. Strayer, J.B. Wallace, S.L. Eggert, G.S. Helfman, and N.E. Leonard. 2007. “The Contribution Of Headwater Streams To Biodiversity In River Networks”. J. Am. Water Resour. Assoc 43: 86-103.